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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 | /* * Driver for Texas Instruments / National Semiconductor LM95234 * * Copyright (c) 2013, 2014 Guenter Roeck <linux@roeck-us.net> * * Derived from lm95241.c * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/sysfs.h> #define DRVNAME "lm95234" enum chips { lm95233, lm95234 }; static const unsigned short normal_i2c[] = { 0x18, 0x2a, 0x2b, 0x4d, 0x4e, I2C_CLIENT_END }; /* LM95234 registers */ #define LM95234_REG_MAN_ID 0xFE #define LM95234_REG_CHIP_ID 0xFF #define LM95234_REG_STATUS 0x02 #define LM95234_REG_CONFIG 0x03 #define LM95234_REG_CONVRATE 0x04 #define LM95234_REG_STS_FAULT 0x07 #define LM95234_REG_STS_TCRIT1 0x08 #define LM95234_REG_STS_TCRIT2 0x09 #define LM95234_REG_TEMPH(x) ((x) + 0x10) #define LM95234_REG_TEMPL(x) ((x) + 0x20) #define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */ #define LM95234_REG_UTEMPL(x) ((x) + 0x29) #define LM95234_REG_REM_MODEL 0x30 #define LM95234_REG_REM_MODEL_STS 0x38 #define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */ #define LM95234_REG_TCRIT1(x) ((x) + 0x40) #define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */ #define LM95234_REG_TCRIT_HYST 0x5a #define NATSEMI_MAN_ID 0x01 #define LM95233_CHIP_ID 0x89 #define LM95234_CHIP_ID 0x79 /* Client data (each client gets its own) */ struct lm95234_data { struct i2c_client *client; const struct attribute_group *groups[3]; struct mutex update_lock; unsigned long last_updated, interval; /* in jiffies */ bool valid; /* false until following fields are valid */ /* registers values */ int temp[5]; /* temperature (signed) */ u32 status; /* fault/alarm status */ u8 tcrit1[5]; /* critical temperature limit */ u8 tcrit2[2]; /* high temperature limit */ s8 toffset[4]; /* remote temperature offset */ u8 thyst; /* common hysteresis */ u8 sensor_type; /* temperature sensor type */ }; static int lm95234_read_temp(struct i2c_client *client, int index, int *t) { int val; u16 temp = 0; if (index) { val = i2c_smbus_read_byte_data(client, LM95234_REG_UTEMPH(index - 1)); if (val < 0) return val; temp = val << 8; val = i2c_smbus_read_byte_data(client, LM95234_REG_UTEMPL(index - 1)); if (val < 0) return val; temp |= val; *t = temp; } /* * Read signed temperature if unsigned temperature is 0, * or if this is the local sensor. */ if (!temp) { val = i2c_smbus_read_byte_data(client, LM95234_REG_TEMPH(index)); if (val < 0) return val; temp = val << 8; val = i2c_smbus_read_byte_data(client, LM95234_REG_TEMPL(index)); if (val < 0) return val; temp |= val; *t = (s16)temp; } return 0; } static u16 update_intervals[] = { 143, 364, 1000, 2500 }; /* Fill value cache. Must be called with update lock held. */ static int lm95234_fill_cache(struct lm95234_data *data, struct i2c_client *client) { int i, ret; ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE); if (ret < 0) return ret; data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]); for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) { ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i)); if (ret < 0) return ret; data->tcrit1[i] = ret; } for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) { ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i)); if (ret < 0) return ret; data->tcrit2[i] = ret; } for (i = 0; i < ARRAY_SIZE(data->toffset); i++) { ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i)); if (ret < 0) return ret; data->toffset[i] = ret; } ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST); if (ret < 0) return ret; data->thyst = ret; ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); if (ret < 0) return ret; data->sensor_type = ret; return 0; } static int lm95234_update_device(struct lm95234_data *data) { struct i2c_client *client = data->client; int ret; mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + data->interval) || !data->valid) { int i; if (!data->valid) { ret = lm95234_fill_cache(data, client); if (ret < 0) goto abort; } data->valid = false; for (i = 0; i < ARRAY_SIZE(data->temp); i++) { ret = lm95234_read_temp(client, i, &data->temp[i]); if (ret < 0) goto abort; } ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT); if (ret < 0) goto abort; data->status = ret; ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1); if (ret < 0) goto abort; data->status |= ret << 8; ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2); if (ret < 0) goto abort; data->status |= ret << 16; data->last_updated = jiffies; data->valid = true; } ret = 0; abort: mutex_unlock(&data->update_lock); return ret; } static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); if (ret) return ret; return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(data->temp[index] * 125, 32)); } static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); u32 mask = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); if (ret) return ret; return sprintf(buf, "%u", !!(data->status & mask)); } static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); u8 mask = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); if (ret) return ret; return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n"); } static ssize_t set_type(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct lm95234_data *data = dev_get_drvdata(dev); unsigned long val; u8 mask = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); if (ret) return ret; ret = kstrtoul(buf, 10, &val); if (ret < 0) return ret; if (val != 1 && val != 2) return -EINVAL; mutex_lock(&data->update_lock); if (val == 1) data->sensor_type |= mask; else data->sensor_type &= ~mask; data->valid = false; i2c_smbus_write_byte_data(data->client, LM95234_REG_REM_MODEL, data->sensor_type); mutex_unlock(&data->update_lock); return count; } static ssize_t show_tcrit2(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); if (ret) return ret; return sprintf(buf, "%u", data->tcrit2[index] * 1000); } static ssize_t set_tcrit2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; long val; int ret = lm95234_update_device(data); if (ret) return ret; ret = kstrtol(buf, 10, &val); if (ret < 0) return ret; val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127); mutex_lock(&data->update_lock); data->tcrit2[index] = val; i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT2(index), val); mutex_unlock(&data->update_lock); return count; } static ssize_t show_tcrit2_hyst(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); if (ret) return ret; /* Result can be negative, so be careful with unsigned operands */ return sprintf(buf, "%d", ((int)data->tcrit2[index] - (int)data->thyst) * 1000); } static ssize_t show_tcrit1(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; return sprintf(buf, "%u", data->tcrit1[index] * 1000); } static ssize_t set_tcrit1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); long val; if (ret) return ret; ret = kstrtol(buf, 10, &val); if (ret < 0) return ret; val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255); mutex_lock(&data->update_lock); data->tcrit1[index] = val; i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT1(index), val); mutex_unlock(&data->update_lock); return count; } static ssize_t show_tcrit1_hyst(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); if (ret) return ret; /* Result can be negative, so be careful with unsigned operands */ return sprintf(buf, "%d", ((int)data->tcrit1[index] - (int)data->thyst) * 1000); } static ssize_t set_tcrit1_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); long val; if (ret) return ret; ret = kstrtol(buf, 10, &val); if (ret < 0) return ret; val = DIV_ROUND_CLOSEST(val, 1000); val = clamp_val((int)data->tcrit1[index] - val, 0, 31); mutex_lock(&data->update_lock); data->thyst = val; i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT_HYST, val); mutex_unlock(&data->update_lock); return count; } static ssize_t show_offset(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); if (ret) return ret; return sprintf(buf, "%d", data->toffset[index] * 500); } static ssize_t set_offset(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct lm95234_data *data = dev_get_drvdata(dev); int index = to_sensor_dev_attr(attr)->index; int ret = lm95234_update_device(data); long val; if (ret) return ret; ret = kstrtol(buf, 10, &val); if (ret < 0) return ret; /* Accuracy is 1/2 degrees C */ val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127); mutex_lock(&data->update_lock); data->toffset[index] = val; i2c_smbus_write_byte_data(data->client, LM95234_REG_OFFSET(index), val); mutex_unlock(&data->update_lock); return count; } static ssize_t show_interval(struct device *dev, struct device_attribute *attr, char *buf) { struct lm95234_data *data = dev_get_drvdata(dev); int ret = lm95234_update_device(data); if (ret) return ret; return sprintf(buf, "%lu\n", DIV_ROUND_CLOSEST(data->interval * 1000, HZ)); } static ssize_t set_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct lm95234_data *data = dev_get_drvdata(dev); int ret = lm95234_update_device(data); unsigned long val; u8 regval; if (ret) return ret; ret = kstrtoul(buf, 10, &val); if (ret < 0) return ret; for (regval = 0; regval < 3; regval++) { if (val <= update_intervals[regval]) break; } mutex_lock(&data->update_lock); data->interval = msecs_to_jiffies(update_intervals[regval]); i2c_smbus_write_byte_data(data->client, LM95234_REG_CONVRATE, regval); mutex_unlock(&data->update_lock); return count; } static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, BIT(0) | BIT(1)); static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, BIT(2) | BIT(3)); static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, BIT(4) | BIT(5)); static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, BIT(6) | BIT(7)); static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type, BIT(1)); static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type, BIT(2)); static SENSOR_DEVICE_ATTR(temp4_type, S_IWUSR | S_IRUGO, show_type, set_type, BIT(3)); static SENSOR_DEVICE_ATTR(temp5_type, S_IWUSR | S_IRUGO, show_type, set_type, BIT(4)); static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_tcrit1, set_tcrit1, 0); static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_tcrit2, set_tcrit2, 0); static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_tcrit2, set_tcrit2, 1); static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_tcrit1, set_tcrit1, 3); static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_tcrit1, set_tcrit1, 4); static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_tcrit1_hyst, set_tcrit1_hyst, 0); static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 0); static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 1); static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 3); static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 4); static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, BIT(0 + 8)); static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, BIT(1 + 16)); static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, BIT(2 + 16)); static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, BIT(3 + 8)); static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, BIT(4 + 8)); static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_tcrit1, set_tcrit1, 1); static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_tcrit1, set_tcrit1, 2); static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 1); static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 2); static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, BIT(1 + 8)); static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, BIT(2 + 8)); static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_offset, set_offset, 0); static SENSOR_DEVICE_ATTR(temp3_offset, S_IWUSR | S_IRUGO, show_offset, set_offset, 1); static SENSOR_DEVICE_ATTR(temp4_offset, S_IWUSR | S_IRUGO, show_offset, set_offset, 2); static SENSOR_DEVICE_ATTR(temp5_offset, S_IWUSR | S_IRUGO, show_offset, set_offset, 3); static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval, set_interval); static struct attribute *lm95234_common_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, &sensor_dev_attr_temp2_fault.dev_attr.attr, &sensor_dev_attr_temp3_fault.dev_attr.attr, &sensor_dev_attr_temp2_type.dev_attr.attr, &sensor_dev_attr_temp3_type.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, &sensor_dev_attr_temp3_max.dev_attr.attr, &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, &sensor_dev_attr_temp2_max_hyst.dev_attr.attr, &sensor_dev_attr_temp3_max_hyst.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, &sensor_dev_attr_temp2_crit.dev_attr.attr, &sensor_dev_attr_temp3_crit.dev_attr.attr, &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr, &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp2_offset.dev_attr.attr, &sensor_dev_attr_temp3_offset.dev_attr.attr, &dev_attr_update_interval.attr, NULL }; static const struct attribute_group lm95234_common_group = { .attrs = lm95234_common_attrs, }; static struct attribute *lm95234_attrs[] = { &sensor_dev_attr_temp4_input.dev_attr.attr, &sensor_dev_attr_temp5_input.dev_attr.attr, &sensor_dev_attr_temp4_fault.dev_attr.attr, &sensor_dev_attr_temp5_fault.dev_attr.attr, &sensor_dev_attr_temp4_type.dev_attr.attr, &sensor_dev_attr_temp5_type.dev_attr.attr, &sensor_dev_attr_temp4_max.dev_attr.attr, &sensor_dev_attr_temp5_max.dev_attr.attr, &sensor_dev_attr_temp4_max_hyst.dev_attr.attr, &sensor_dev_attr_temp5_max_hyst.dev_attr.attr, &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, &sensor_dev_attr_temp4_offset.dev_attr.attr, &sensor_dev_attr_temp5_offset.dev_attr.attr, NULL }; static const struct attribute_group lm95234_group = { .attrs = lm95234_attrs, }; static int lm95234_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; int address = client->addr; u8 config_mask, model_mask; int mfg_id, chip_id, val; const char *name; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -ENODEV; mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID); if (mfg_id != NATSEMI_MAN_ID) return -ENODEV; chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID); switch (chip_id) { case LM95233_CHIP_ID: if (address != 0x18 && address != 0x2a && address != 0x2b) return -ENODEV; config_mask = 0xbf; model_mask = 0xf9; name = "lm95233"; break; case LM95234_CHIP_ID: if (address != 0x18 && address != 0x4d && address != 0x4e) return -ENODEV; config_mask = 0xbc; model_mask = 0xe1; name = "lm95234"; break; default: return -ENODEV; } val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS); if (val & 0x30) return -ENODEV; val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG); if (val & config_mask) return -ENODEV; val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE); if (val & 0xfc) return -ENODEV; val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); if (val & model_mask) return -ENODEV; val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS); if (val & model_mask) return -ENODEV; strlcpy(info->type, name, I2C_NAME_SIZE); return 0; } static int lm95234_init_client(struct i2c_client *client) { int val, model; /* start conversion if necessary */ val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG); if (val < 0) return val; if (val & 0x40) i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG, val & ~0x40); /* If diode type status reports an error, try to fix it */ val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS); if (val < 0) return val; model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); if (model < 0) return model; if (model & val) { dev_notice(&client->dev, "Fixing remote diode type misconfiguration (0x%x)\n", val); i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL, model & ~val); } return 0; } static int lm95234_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct lm95234_data *data; struct device *hwmon_dev; int err; data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL); if (!data) return -ENOMEM; data->client = client; mutex_init(&data->update_lock); /* Initialize the LM95234 chip */ err = lm95234_init_client(client); if (err < 0) return err; data->groups[0] = &lm95234_common_group; if (id->driver_data == lm95234) data->groups[1] = &lm95234_group; hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, data->groups); return PTR_ERR_OR_ZERO(hwmon_dev); } /* Driver data (common to all clients) */ static const struct i2c_device_id lm95234_id[] = { { "lm95233", lm95233 }, { "lm95234", lm95234 }, { } }; MODULE_DEVICE_TABLE(i2c, lm95234_id); static struct i2c_driver lm95234_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = DRVNAME, }, .probe = lm95234_probe, .id_table = lm95234_id, .detect = lm95234_detect, .address_list = normal_i2c, }; module_i2c_driver(lm95234_driver); MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); MODULE_DESCRIPTION("LM95233/LM95234 sensor driver"); MODULE_LICENSE("GPL"); |